Outdoor Manager-KING Sealed Bearing Headset Fixed Gear Road Bike Cycle NotThread Extranal Headset 1.34In Material:Aluminum Aolly Bearings: 2 Sealed Angular Cartridge Bearings Diameter: 1.124In*1.34In*0.91In (28.6 x 34 x 23mm) Suitable for Fixed Gear/ Bike/ Road Bike Weight:113g